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[Sellingaccs]

Not possible, unless you sent the transaction by yourself and have the private key.
If you have the private key, respending the funds with a higher fee is possible but just knowing a random hash is not going to help you as the point of cryptography is to create trust, so you need access to a private key.

You'll need to provide more information about your problem, what you are trying to do, what software you are using for the tx etc.

[TryNinja]

someone made a contest about finding a hidden signed  Tx

and If you can find it, It is yours.

& The TX has a payment of the prize amount

Doesn't that mean that the owner of the address already decided to which address the coins are going and there is no way you can change it? You can't simple change the output address in an already signed transaction.

*please correct me if I'm wrong*

[aleksej996]

In theory you could create anyone-can-spend transaction, but if you are referring to standard Bitcoin transactions your question wouldn't make any sense.

Of course, you can't derive a private key from anything, it is called private for a reason.

Hash of every transaction on the Bitcoin blockchain is publicly known to everyone in the Bitcoin network and you can see them all with any block explorer.
So this is in no way a secret information. It is just unique for every transaction so you could identify a transaction with it, but nothing else.

[pooya87]

someone made a contest about finding a hidden signed  Tx

and also he give us a Hash
i mean can i extract a private key from this info

there is just not enough information in your comments to give you "the answer" you are looking for. usually these "puzzles" are more complicated than that. the hash that you have can be anything! maybe it is hash of a link containing further instructions. maybe it is hash of a transaction that has an OP_Return with the next step in it!

or maybe what you are calling "hash" is a hex and that IS the private key but that sounds too simple!
example: 0C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D is the private key of 1GAehh7TsJAHuUAeKZcXf5CnwuGuGgyX2S (https://en.bitcoin.it/wiki/Wallet_import_format)

[btcdevil]

In a simple way if a transaction have been transacted and it got confirmed then nothing can be done but if it got stuck due to low fee then it can get cancelled and you can resend it.